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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        let arr = [1, 2, 3];
        let arr1 = [4, 5, 6];
        console.log(arr);
        arr.push(...arr1); //合并 //123456
        // 
        function fun(a, ...value) {
            console.log(value);

        }
        fun(1, 2, 3, 4, 5);
    </script>
</body>

</html>